add host picker tray flow for Codex and DeepSeek Harness

[starsstreaming]

Summary

• Startup host picker chooses Codex or DeepSeek Harness
• session-host routes to the matching adapter via --host
• Per-host engine mutexes and polished picker UI aligned with tray style
• Dedicated start-beauticode.ps1 / start-beauticode-dsh.ps1 launchers

Stack

Base: feat/adapter-dsh

Test plan

• session-host DSH mode test passes
• CI green
• Manual: picker launches Codex path and DSH path

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